Bluetooth 5.0, signal transfer is faster, stable and in higher quality 3 in 1 Bluetooth adapter with Bluetooth receive and Bluetooth transmit function Compatible with Android/iOS phone system and all Bluetooth audio devices for TV, speaker, PC, etc. Note: No driver is required when used on the computer. If the prompt "Unable to recognize device" when transferring audio on the computer, it means that the USB port is not inserted correctly. When using USB data cable to transfer audio from computer, there is no need to use 3.5mm audio cable. When transferring audio on a computer using a USB data cable, the volume of the computer system cannot be adjusted, only the volume of the playback software (music player, video player) or Bluetooth speaker (Bluetooth headset) can be adjusted. This device does not support voice call or voice assistant function. Specification: Bluetooth version: Bluetooth V5.0 + EDR Bluetooth profile: AVRCP (receiver mode only), A2DP Input: 5V 1A Battery capacity: 300mAh Charging port: Micro USB Receiver mode playback time: 10 hours Transmitter mode playback time: 7 hours Charging time: 1 hour Working distance: 10-15m